The effect of heat treatment on the structure and hardness of pulse electrodeposited NiP-WC composite coatings

Zoikis-Karathanasis, A; Pavlatou, EA; Spyrellis, N

dc.contributor.author	Zoikis-Karathanasis, A	en
dc.contributor.author	Pavlatou, EA	en
dc.contributor.author	Spyrellis, N	en
dc.date.accessioned	2014-03-01T01:32:03Z
dc.date.available	2014-03-01T01:32:03Z
dc.date.issued	2009	en
dc.identifier.issn	0013-4686	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20044
dc.subject	Heat treatment	en
dc.subject	Nickel phosphorous alloy	en
dc.subject	Pulse electrodeposition	en
dc.subject	Tungsten carbide	en
dc.subject	X-ray diffraction	en
dc.subject.classification	Electrochemistry	en
dc.subject.other	Diffraction	en
dc.subject.other	Diffusion coatings	en
dc.subject.other	Electrodeposition	en
dc.subject.other	Heat treating furnaces	en
dc.subject.other	Heat treatment	en
dc.subject.other	Metallic matrix composites	en
dc.subject.other	Microhardness	en
dc.subject.other	Nickel	en
dc.subject.other	Nickel alloys	en
dc.subject.other	Organic coatings	en
dc.subject.other	Phosphorus	en
dc.subject.other	Tungsten	en
dc.subject.other	Tungsten carbide	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Diffusion phenomenon	en
dc.subject.other	Experimental datum	en
dc.subject.other	Higher temperatures	en
dc.subject.other	matrixes	en
dc.subject.other	Mean diameters	en
dc.subject.other	Nickel phosphorous alloy	en
dc.subject.other	Pulse currents	en
dc.subject.other	Pulse electrodeposition	en
dc.subject.other	Thermal treatments	en
dc.subject.other	Watts baths	en
dc.subject.other	Wc particles	en
dc.subject.other	Composite coatings	en
dc.title	The effect of heat treatment on the structure and hardness of pulse electrodeposited NiP-WC composite coatings	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.electacta.2008.07.027	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.electacta.2008.07.027	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	In the present work pure nickel-phosphorous and nickel-phosphorous composite coatings with WC particles (mean diameter 200 nm) have been produced under both direct and pulse current conditions, from a modified, organic-free, Watts bath. The produced coatings were thermally treated at various temperatures and the structure, morphology and the microhardness of the deposits were examined after each cycle of heat treatment. Imposition of pulse current conditions led to composite deposits with high-incorporation percentage of WC particles in the matrix. Also, the presence of WC particles resulted in coatings with enhanced microhardness values and retarded diffusion phenomena in the deposits during thermal treatment. Annealing of all coatings at 400 degrees C revealed complete crystallization of the matrix to the phases of Ni, Ni2P and Ni3P accompanied by a significant increase of microhardness for all deposits. Further heating at higher temperatures demonstrated a decrease in microhardness of both kinds of deposits. The experimental data proved that it is possible to produce NiP-WC composite coatings under specific pulse current conditions followed by proper thermal treatment that exhibited considerable enhanced microhardness. (C) 2008 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Electrochimica Acta	en
dc.identifier.doi	10.1016/j.electacta.2008.07.027	en
dc.identifier.isi	ISI:000264743900025	en
dc.identifier.volume	54	en
dc.identifier.issue	9	en
dc.identifier.spage	2563	en
dc.identifier.epage	2570	en